vertical stabiliser vs vertical fin

vertical stabiliser and vertical fin both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertical stabiliser	Yes	No	No	No
vertical fin	Yes	No	No	No

As nouns, vertical stabiliser and vertical fin are synonyms defined as:

vertical stabiliser and vertical fin: a stabilizer that is part of the vertical tail structure of an airplane

Other synonyms of vertical stabiliser include tail fin, tailfin, vertical stabilizer.

vertical stabiliser (noun)	vertical fin (noun)
a stabilizer that is part of the vertical tail structure of an airplane	a stabilizer that is part of the vertical tail structure of an airplane